All primary shards are assigned, but one or more replica shards are
unassigned. If a node in the cluster fails, some data could be unavailable
until that node is repaired.
Returns the enum constant of this class with the specified name.
The string must match exactly an identifier used to declare an
enum constant in this class. (Extraneous whitespace characters are
not permitted.)
Parameters:
name - the name of the enum constant to be returned.